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WHIRLWIND MINE <br />Dewatering Use <br /> <br /> <br /> <br /> <br />onth/Year <br />Volume <br />Dewatered and <br />Treated <br />(gal) <br /> <br />Evaporation <br />rate <br />(in) Estimated <br />Evaporation <br />from Untreated <br />Water Tank <br />(gal) ` <br /> <br /> <br />otal <br />(gal) <br />Year 1 Total 1,621,326 57.45 160,947 1,782,273 <br />November 2008 79,489 1.61 4,640 84,129 <br />December 2008 89,942 1.26 3,632 93,574 <br />January 2009 89,801 1.68 4,842 94,643 <br />February 2009 92,971 1.49 4,295 97,266 <br />March 2009 90,023 3.34 9,627 99,650 <br />April 2009 103,542 5.69 16,400 119,942 <br />May 2009 87,960 7.49 21,588 109,548 <br />June 2009 92,635 9.47 27,295 119,930 <br />Jul 2009 11,271 9.04 26,056 37,327 <br />August 2009 95,506 7.39 21,300 116,806 <br />September 2009 104,559 5.54 15,968 120,527 <br />October 2009 151,303 , 3.45 9,944 161,247 <br />Year 2 Total 1,089,002 57.45 165,588 1,254,590 <br />1 - Estimated evaporation rates based on average monthly pan evaporation data reported for <br />Montrose, Colorado by Western Regional Climate Center (wrcc.dri.edu)